There are three sizes but no dimensions. As best I can figure, Size 0 is for those who are under 18. Size I for those who are 18-30 and no kids. Size II for those who are over 30 or have had kids. They have a little nub instead of a stem.
Could someone who speaks Spanish ask them for the dimensions of their cups? Thanks.
EDIT:
Never mind, they don't seem to be available after all. There's no way to order at their site.